org.apache.clerezza.utils.IRIUtil Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor  license  agreements.  See the NOTICE file distributed
 * with this work  for  additional  information  regarding  copyright
 * ownership.  The ASF  licenses  this file to you under  the  Apache
 * License, Version 2.0 (the "License"); you may not  use  this  file
 * except in compliance with the License.  You may obtain  a copy  of
 * the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless  required  by  applicable law  or  agreed  to  in  writing,
 * software  distributed  under  the  License  is  distributed  on an
 * "AS IS"  BASIS,  WITHOUT  WARRANTIES  OR  CONDITIONS  OF ANY KIND,
 * either  express  or implied.  See  the License  for  the  specific
 * language governing permissions and limitations under  the License.
 */
package org.apache.clerezza.utils;

/**
 * A utility class for IRI and String manipulations.
 *
 * @author tio
 */
public class IRIUtil {

    /**
     * Strips #x00 - #x1F and #x7F-#x9F from a Unicode string
     *
     * @param inputChars
     * @return the stripped string
     * @see 
     * http://www.w3.org/TR/rdf-concepts/#dfn-URI-reference and
     * replaces all US-ASCII space character with a "+".
     */
    public static String stripNonIRIChars(CharSequence inputChars) {

        if (inputChars == null) {
            return "";
        }

        StringBuffer buffer = new StringBuffer();

        for (int i = 0; i < inputChars.length(); i++) {
            char c = inputChars.charAt(i);

            if (!isIllegal(c)) {
                buffer.append(c);
            }
        }
        return buffer.toString().replaceAll("\\s+", "+");
    }

    private static boolean isIllegal(char ch) {
        if ((ch >= 0x7F) && (ch <= 0x9F)) {
            return true;
        }
        return false;
    }
}